Hormonal Control

• What is the role of the endocrine system in multicellular organisms?

  Control and communication
• How do hormones function in the endocrine system?

  They act as chemical messengers
• What is the significance of receptor proteins in target tissues?

  They bind hormones to initiate responses
• Why do only certain tissues respond to specific hormones?

  Only certain tissues have the appropriate receptors
• Which hormone helps regulate blood water concentration?

  ADH
• What is the function of the pancreas in the endocrine system?

  Monitors glucose concentration in blood
• What are the two protein hormones produced by the pancreas?

  Insulin and glucagon
• When is insulin released by the pancreas?

  When blood glucose concentration increases
• What effect does insulin have on the liver?

  It causes the liver to take up glucose
• When is glucagon released by the pancreas?

  When blood glucose concentration decreases
• What is glycogen?

  A stored form of glucose
• What does glucagon do to glycogen in the liver?

  It causes glycogen to break down into glucose
• What happens to glucose after glucagon acts on the liver?

  It is released into the blood